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One of my attic fans is very annoying when it comes on.
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Sounds like bearings probably going dry - you could also check if there are little oiling holes (with or without a felt wick) at the ends over the bearings - takes 2-3 drops of oil (household/gun/sewing machine oil) yearly IF there are oil holes in the housing at the end bearings - some bearings are sealed and have to be replaced 9or the unit replaced) when they go out.
Answered 3 years ago by LCD
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